quote from George......... "It could be a toothpick holder, for the table, especially if intended for the French market!".
Sorry to show my ignorance, but why the French in particular

- although agree tooth pick holder sounds possible.
would discount the idea of eye bath or salt - and would people really eat something as expensive as caviar from a press moulded item like this, and as far as I remember mustards have lids (this might have lost its lid, although the ground rim would be appropriate for one).
what about a match striker?